Tif an wld file problems

[Doug Nebert]

You can even save it as an LZW compressed TIFF (if you have 
licensed software) and it will work fine, too.  I have a 56MB 
TIFF I am working with and after compression it is 8MB with 
no noticeable performance hit. The TIFF indexing seems very 
efficient in the mapserv.

Doug.

Robert Chavez wrote:
> 
> That was the problem. I saved it as an uncompressed 8-bit and it works jut
> fine.  Thanks for the tip!
> 
> Rob
> 
> On Wed, 16 Feb 2000, Doug Nebert wrote:
> 
> > It is possible that you have a 24-bit TIFF file.  It will only
> > render if it is 8-bit, or so I experienced a few months back.
> > Try again by saving the TIF as 8-bit and see what happens.
> >
> > Doug.
> >
> > Robert Chavez wrote:
> > >
> > > Greetings,
> > >
> > > I started fooling around with displaying tifs using mapscript and I'm
> > > having a problem rendering a tif image layer.  I've run the demo package
> > > and displayed the landsat tif with mapserver just fine, so I know
> > > mapserver/script compiled with the tif libraries.
> > >
> > > The tif originally had a .tfw  file so I changed the extension to
> > > .wld (it looks like this, units are in meters)
> > >
> > > 1.32301253030703
> > > 0.00000000000000
> > > 0.00000000000000
> > > -1.16784976858186
> > > 531694.70377556235000
> > > 181396.49239035073000
> > >
> > > After the script runs I get a blank .gif file as a result, no rendering of
> > > the tif in site.  This leads me to believe there's an extent problem
> > > somewhere but I'm not sure where.  The image should fit within the extents
> > > of the map file (see map file below), I should be getting something even
> > > if at a very small scale. I thought .tfw files were structurally identical
> > > with .wld files, or have I missed something?
> > >
> > > MAP
> > >   NAME test
> > >   SIZE 500 500
> > >   EXTENT 520118.780 175873.500 534426.880 184948.500
> > >   UNITS METERS
> > >   SHAPEPATH "data"
> > >
> > >   LAYER
> > >     NAME stpauls
> > >     TYPE RASTER
> > >     STATUS ON
> > >     DATA stpauls.tif
> > >   END
> > > END
> > >
> > > Regards,
> > >
> > > Robert Chavez
> > > Perseus Project
> > > rchavez at perseus.tufts.edu
> >
> > --
> > Douglas D. Nebert
> > Clearinghouse Coordinator
> > FGDC Secretariat      Phone: +1 703 648 4151  Fax: +1 703 648-5755
> > Pager Messaging:      http://fgdclearhs.er.usgs.gov/dougmsg.html
> >

-- 
Douglas D. Nebert
Clearinghouse Coordinator 
FGDC Secretariat	Phone: +1 703 648 4151	Fax: +1 703 648-5755	
Pager Messaging: 	http://fgdclearhs.er.usgs.gov/dougmsg.html